<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
	<title>YUI Library Examples: ImageLoader Utility: ImageLoader with TabView</title>
    

    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    	<link rel="stylesheet" type="text/css" href="../../assets/yui.css" >

<style>
/*Supplemental CSS for the YUI distribution*/
#custom-doc { width: 95%; min-width: 950px; }
#pagetitle {background-image: url(../../assets/bg_hd.gif);}
</style>

<link rel="stylesheet" type="text/css" href="../../assets/dpSyntaxHighlighter.css">
<!--Script and CSS includes for YUI dependencies on this page-->
<link rel="stylesheet" type="text/css" href="../../build/logger/assets/skins/sam/logger.css" />
<link rel="stylesheet" type="text/css" href="../../build/tabview/assets/skins/sam/tabview.css" />
<link rel="stylesheet" type="text/css" href="../../build/button/assets/skins/sam/button.css" />
<script type="text/javascript" src="../../build/yuiloader/yuiloader-min.js"></script>
<script type="text/javascript" src="../../build/event/event-min.js"></script>
<script type="text/javascript" src="../../build/dom/dom-min.js"></script>
<script type="text/javascript" src="../../build/logger/logger-min.js"></script>
<script type="text/javascript" src="../../build/imageloader/imageloader-debug.js"></script>
<script type="text/javascript" src="../../build/element/element-min.js"></script>
<script type="text/javascript" src="../../build/tabview/tabview-min.js"></script>
<script type="text/javascript" src="../../build/button/button-min.js"></script>

<!--there is no custom header content for this example-->


<script type="text/javascript">
//enable passthrough of errors from YUI Event:
if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
	YAHOO.util.Event.throwErrors = true;
}
</script>
</head>
<body id="yahoo-com" class="yui-skin-sam">
<div id="custom-doc" class="yui-t2">
<div id="hd">
	<div id="ygunav">
		<p><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></p>
		<form action="http://search.yahoo.com/search" id="sitesearchform">
		<input name="vs" type="hidden" value="developer.yahoo.com">
		<input name="vs" type="hidden" value="yuiblog.com">
		<div id="sitesearch">
			<label for="searchinput">Site Search (YDN &amp; YUIBlog): </label>
			<input type="text" id="searchinput" name="p">
			<input type="submit" value="Search" id="searchsubmit" class="ygbt">
		</div>
		</form>	</div>
	<div id="ygma"><a href="../../"><img src="../../assets/yui.gif"  border="0" height="38"></a></div>
	<div id="pagetitle"><h1>YUI Library Examples: ImageLoader Utility: ImageLoader with TabView</h1></div>
</div>
<div id="bd">
	
	<div id="yui-main">
		<div class="yui-b">
		  <div class="yui-ge">
			  <div class="yui-u first example">

    
	<div class="promo">
	<h1>ImageLoader Utility: ImageLoader with TabView</h1>
	
	<div class="exampleIntro">
	<p>Here we demonstrate integrating the <a href="http://developer.yahoo.com/yui/imageloader/">ImageLoader Utility</a> with the <a href="http://developer.yahoo.com/yui/tabview/">TabView Control</a>.</p>

<p>Also illustrated are the considerations for the ImageLoader group triggers, as they involve some reasoning on the developer's part.</p>

<p>Here, each tab contains images and a corresponding ImageLoader group. Triggers are set as <code>mouseover</code> events of each tab.</p>

			
	</div>	
					
	<div class="example-container module ">
			<div class="hd exampleHd">
			<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="imgloadtabs_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->		
		</div>		<div id="example-canvas" class="bd">
	
		
	<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
	
	<html>

<!-- optional skin for border tabs --> 
<link rel='stylesheet' type='text/css' href='http://yui.yahooapis.com/2.2.2/build/tabview/assets/border_tabs.css'> 

<style type='text/css'>
#demo { width:350px; }
#demo .yui-content { padding:20px; } /* pad content container */
#demo img { margin-right:20px; }
#tabone, #tabtwo, #tabthree { height:80px; }
</style>


<div id='demo' class='yui-navset'>
	<ul class='yui-nav'>
		<li class='selected' id='tabOneLabel'><a href='#tabone'><em>Tab One</em></a></li>
		<li id='tabTwoLabel'><a href='#tabtwo'><em>Tab Two</em></a></li>
		<li id='tabThreeLabel'><a href='#tabthree'><em>Tab Three</em></a></li>
	</ul>
	<div class='yui-content'>
		<div id='tabone'>
			<img id='imgOne' src='http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/museum.jpg' />
		</div>
		<div id='tabtwo'>
			<img id='imgTwo' title='"imgTwo"' />
			<img id='imgThree' title='"imgThree"' />
		</div>
		<div id='tabthree'>
			<img id='imgFour' title='"imgFour"' />
			<img id='imgFive' title='"imgFive"' />
		</div>
	</div>
</div>



<script>
var tabView = new YAHOO.widget.TabView('demo');

var tabTwoImageGroup = new YAHOO.util.ImageLoader.group('tabTwoLabel', 'mouseover');
tabTwoImageGroup.registerSrcImage('imgTwo', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/uluru.jpg');
tabTwoImageGroup.registerSrcImage('imgThree', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/katatjuta.jpg');
tabTwoImageGroup.addTrigger('tabTwoLabel', 'focus');
tabTwoImageGroup.name = 'tab_two_group';

var tabThreeImageGroup = new YAHOO.util.ImageLoader.group('tabThreeLabel', 'mouseover');
tabThreeImageGroup.registerSrcImage('imgFour', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/morraine.jpg');
tabThreeImageGroup.registerSrcImage('imgFive', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/japan.jpg');
tabThreeImageGroup.addTrigger('tabThreeLabel', 'focus');
tabThreeImageGroup.name = 'tab_three_group';


</script>

</html>
	
	<!--END SOURCE CODE FOR EXAMPLE =============================== -->
	
		
		</div>
		
	
	</div>			
	</div>
		
	<h2 class='first'>Using ImageLoader with TabView</h2>

<p>By nature, tabbed modules conceal some page content. If any of the non-default tabs contain images, then they are prime candidates for use with the ImageLoader Utility.</p>

<p>After we've created the TabView HTML and JavaScript object, we set up one ImageLoader group per tab. The first tab needs no delayed image loading because its image is immediately visible. Here is how we set up the second tab:</p>

<textarea name='code' class='JScript' cols='60' rows='1'>
var tabTwoImageGroup = new YAHOO.util.ImageLoader.group('tabTwoLabel', 'mouseover');
tabTwoImageGroup.registerSrcImage('imgTwo', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/uluru.jpg');
tabTwoImageGroup.registerSrcImage('imgThree', 'http://developer.yahoo.com/yui/docs/assets/examples/exampleimages/small/katatjuta.jpg');
tabTwoImageGroup.addTrigger('tabTwoLabel', 'focus');
</textarea>

<p>The third tab is set up exactly the same as the second, with <code>mouseover</code> and <code>focus</code> triggers.</p>

<h2 class='first'>Explanation of the Triggers</h2>

<p>Why do we use a <code>mouseover</code> of the tab label as the trigger? Well, it's the click of the tab label that will expose that tab's images to the user. But we don't want to wait until the images are exposed. We want to do better than that; we want to be as anticipatory as possible. We know that the user must mouse over the tab label before she can click it. And conversely, if the user mouses over the tab label, that's a good indication she is about to click it. These conditions make the label <code>mouseover</code> a fitting trigger.</p>

<p>What about the second trigger we add, the <code>focus</code> event? The reason for this is because there is another way the user can click the tab label and expose the images. Using TabView, we've made the labels <code>&lt;a&gt;</code> elements. Consequently the user could, using her keyboard, <code>tab</code> through the page and click <code>enter</code> on the tab label. This renders our <code>mouseover</code> trigger insufficient because it never fires. Thus we add the <code>focus</code> event trigger, which will fire as soon as the user <code>tabs</code> to the label.</p>

<p>We've omitted a time limit for this group because it's feasible that the user will never be interested in this tab and thus never expose the images. Depending on your use case, you may find a time limit appropriate.</p>


<h2>Configuration for This Example</h2>

<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers.  <a href="http://developer.yahoo.com/yui/articles/hosting/?imageloader&tabview&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>

				</div>
				<div class="yui-u">
						<div id="loggerModule" class="yui-skin-sam">
						<h3 class="firstContent">YUI Logger Output:</h3>
								<div id="loggerDiv"></div>
						</div>
					
				
					<div id="examples">
						<h3>ImageLoader Utility Examples:</h3>
	
						<div id="exampleToc">
							<ul>
								<li><a href='../imageloader/imgloadbasics.html'>Basic Features of the ImageLoader Utility</a></li><li><a href='../imageloader/imgloadfold.html'>Loading Images Below the Fold</a></li><li><a href='../imageloader/imgloadclass.html'>Using ImageLoader with CSS Class Names</a></li><li class='selected'><a href='../imageloader/imgloadtabs.html'>ImageLoader with TabView</a></li>							</ul>
						</div>
					</div>
					
					<div id="module">
						<h3>More ImageLoader Utility Resources:</h3>
						<ul>
							<li><a href="http://developer.yahoo.com/yui/imageloader/">User's Guide</a> (external)</li>
						<li><a href="../../docs/module_imageloader.html">API Documentation</a></li>
                            
                            
							<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/imageloader.pdf">Cheat Sheet PDF</a> (external)</li></ul>
					</div>
			  </div>
		</div>
		
		</div>
	</div>


<div class="yui-b" id="tocWrapper">
<!-- TABLE OF CONTENTS -->
<div id="toc">
	
<ul>
<li class="sect first">Yahoo! UI Library</li><li class="item"><a title="The Yahoo! User Interface Library (YUI)" href="http://developer.yahoo.com/yui/">Home (external)</a></li><li class="item"><a title="The Yahoo! User Interface Blog" href="http://yuiblog.com">YUIBlog (external)</a></li><li class="item"><a title="YUILibrary.com hosts the YUI community forums" href="http://yuilibrary.com/forum/">YUI Discussion Forum (external)</a></li><li class="item"><a title="The YUI Library source can be checked out from GitHub" href="http://github.com/yui/">YUI on GitHub</a></li><li class="item"><a title="Instantly searchable API documentation for the entire YUI library." href="../../docs/index.html">API Documentation</a></li><li class="item"><a title="Examples of every YUI utility and control in action" href="../../examples/">Functional Examples</a></li><li class="item"><a title="Videos and podcasts from the YUI Team and from the Yahoo! frontend engineering community." href="http://developer.yahoo.com/yui/theater/">YUI Theater (external)</a></li><li class="item"><a title="YUI is free and open, offered under a BSD license." href="http://developer.yahoo.com/yui/license.html">YUI License (external)</a></li><li class="sect">YUI Functional Examples</li><li class="item"><a title="The YUI Animation Utility - Functional Examples" href="../../examples/animation/index.html">Animation</a></li><li class="item"><a title="The YUI AutoComplete Control - Functional Examples" href="../../examples/autocomplete/index.html">AutoComplete</a></li><li class="item"><a title="The YUI Browser History Manager - Functional Examples" href="../../examples/history/index.html">Browser History Manager</a></li><li class="item"><a title="The YUI Button Control - Functional Examples" href="../../examples/button/index.html">Button</a></li><li class="item"><a title="The YUI Calendar Control - Functional Examples" href="../../examples/calendar/index.html">Calendar</a></li><li class="item"><a title="The YUI Carousel Control - Functional Examples" href="../../examples/carousel/index.html">Carousel</a></li><li class="item"><a title="The YUI Charts Control - Functional Examples" href="../../examples/charts/index.html">Charts</a></li><li class="item"><a title="The YUI Color Picker Control - Functional Examples" href="../../examples/colorpicker/index.html">Color Picker</a></li><li class="item"><a title="The YUI Cookie Utility - Functional Examples" href="../../examples/cookie/index.html">Cookie</a></li><li class="item"><a title="The YUI Connection Manager (AJAX) - Functional Examples" href="../../examples/connection/index.html">Connection Manager</a></li><li class="item"><a title="The YUI Container Family (Module, Overlay, Tooltip, Panel, Dialog, SimpleDialog) - Functional Examples" href="../../examples/container/index.html">Container</a></li><li class="item"><a title="The YUI DataTable Control - Functional Examples" href="../../examples/datatable/index.html">DataTable</a></li><li class="item"><a title="The YUI Dom Collection - Functional Examples" href="../../examples/dom/index.html">Dom</a></li><li class="item"><a title="The YUI Drag &amp; Drop Utility - Functional Examples" href="../../examples/dragdrop/index.html">Drag &amp; Drop</a></li><li class="item"><a title="The YUI Event Utility - Functional Examples" href="../../examples/event/index.html">Event</a></li><li class="item"><a title="The YUI Get Utility - Functional Examples" href="../../examples/get/index.html">Get</a></li><li class="item"><a title="The YUI ImageCropper Control - Functional Examples" href="../../examples/imagecropper/index.html">ImageCropper</a></li><li class="selected "><a title="The YUI ImageLoader Utility - Functional Examples" href="../../examples/imageloader/index.html">ImageLoader</a></li><li class="item"><a title="The YUI JSON Utility - Functional Examples" href="../../examples/json/index.html">JSON</a></li><li class="item"><a title="The YUI Layout Manager - Functional Examples" href="../../examples/layout/index.html">Layout Manager</a></li><li class="item"><a title="The YUI Logger Control - Functional Examples" href="../../examples/logger/index.html">Logger</a></li><li class="item"><a title="The YUI Menu Control - Functional Examples" href="../../examples/menu/index.html">Menu</a></li><li class="item"><a title="The YUI Paginator - Functional Examples" href="../../examples/paginator/index.html">Paginator</a></li><li class="item"><a title="The YUI Profiler Utility - Functional Examples" href="../../examples/profiler/index.html">Profiler</a></li><li class="item"><a title="The YUI ProfileViewer Control - Functional Examples" href="../../examples/profilerviewer/index.html">ProfilerViewer</a></li><li class="item"><a title="The YUI ProgressBar Control - Functional Examples" href="../../examples/progressbar/index.html">ProgressBar</a></li><li class="item"><a title="The YUI Resize Utility - Functional Examples" href="../../examples/resize/index.html">Resize</a></li><li class="item"><a title="The YUI Rich Text Editor - Functional Examples" href="../../examples/editor/index.html">Rich Text Editor</a></li><li class="item"><a title="The YUI Selector Utility - Functional Examples" href="../../examples/selector/index.html">Selector</a></li><li class="item"><a title="The YUI Slider Control - Functional Examples" href="../../examples/slider/index.html">Slider</a></li><li class="item"><a title="The YUI Storage Utility - Functional Examples" href="../../examples/storage/index.html">Storage</a></li><li class="item"><a title="The YUI SWF Utility - Functional Examples" href="../../examples/swf/index.html">SWF</a></li><li class="item"><a title="The YUI SWFStore Utility - Functional Examples" href="../../examples/swfstore/index.html">SWFStore</a></li><li class="item"><a title="The YUI Stylesheet Utility - Functional Examples" href="../../examples/stylesheet/index.html">Stylesheet</a></li><li class="item"><a title="The YUI TabView Control - Functional Examples" href="../../examples/tabview/index.html">TabView</a></li><li class="item"><a title="The YUI TreeView Control - Functional Examples" href="../../examples/treeview/index.html">TreeView</a></li><li class="item"><a title="The YUI Uploader Utility - Functional Examples" href="../../examples/uploader/index.html">Uploader (experimental)</a></li><li class="item"><a title="The YUI YAHOO Global Object - Functional Examples" href="../../examples/yahoo/index.html">YAHOO Global Object</a></li><li class="item"><a title="The YUI Loader Utility - Functional Examples" href="../../examples/yuiloader/index.html">YUI Loader</a></li><li class="item"><a title="The YUI Test Utility - Functional Examples" href="../../examples/yuitest/index.html">YUI Test</a></li><li class="item"><a title="YUI Reset CSS - Functional Examples" href="../../examples/reset/index.html">Reset CSS</a></li><li class="item"><a title="YUI Base CSS - Functional Examples" href="../../examples/base/index.html">Base CSS</a></li><li class="item"><a title="YUI Fonts CSS - Functional Examples" href="../../examples/fonts/index.html">Fonts CSS</a></li><li class="item"><a title="YUI Grids CSS - Functional Examples" href="../../examples/grids/index.html">Grids CSS</a></li><li class="sect">YUI Articles on the YUI Website</li><li class="item"><a title="Answers to Frequently Asked Questions about the YUI Library" href="http://developer.yahoo.com/yui/articles/faq/">YUI FAQ (external)</a></li><li class="item"><a title="Yahoo!'s philosophy of Graded Browser Support" href="http://developer.yahoo.com/yui/articles/gbs/">Graded Browser Support (external)</a></li><li class="item"><a title="Reporting Bugs and Making Feature Requests for YUI Components" href="http://developer.yahoo.com/yui/articles/reportingbugs/">Bug Reports/Feature Requests (external)</a></li><li class="item"><a title="Serve YUI source files from Yahoo! -- free, fast, and simple" href="http://developer.yahoo.com/yui/articles/hosting/">Serving YUI Files from Yahoo! (external)</a></li><li class="item"><a title="Best practices for working with web services while protecting user privacy" href="http://developer.yahoo.com/security/">Security Best Practices (external)</a></li></ul>
</div>
</div>
	</div><!--closes bd-->

	<div id="ft">
        <p class="first">Copyright &copy; 2010 Yahoo! Inc. All rights reserved.</p>
        <p><a href="http://privacy.yahoo.com/privacy/us/devel/index.html">Privacy Policy</a> - 
            <a href="http://docs.yahoo.com/info/terms/">Terms of Service</a> - 
            <a href="http://docs.yahoo.com/info/copyright/copyright.html">Copyright Policy</a> - 
            <a href="http://careers.yahoo.com/">Job Openings</a></p>
	</div>
</div>
<script src="../../assets/syntax.js"></script>
<script src="../../assets/dpSyntaxHighlighter.js"></script>
<script language="javascript"> 
dp.SyntaxHighlighter.HighlightAll('code'); 
</script>

<script src='../../assets/YUIexamples.js'></script>


</body>
</html>
